Cite

State Highway Department's official automobile road map of the state of Oregon showing all through trunk highways and main traveled roads, with mileages / Oregon State Highway Commission.

MLA

Commission, Oregon State Highway. State Highway Department's Official Automobile Road Map of the State of Oregon Showing All through Trunk Highways and Main Traveled Roads, with Mileages / Oregon State Highway Commission. Oregon State Highway Commission, 1923. https://collections.library.yale.edu/catalog/15821613.

APA, 6th edition

Commission, O. S. H. (1923). State Highway Department's official automobile road map of the state of Oregon showing all through trunk highways and main traveled roads, with mileages / Oregon State Highway Commission. [Road maps]. Oregon State Highway Commission, https://collections.library.yale.edu/catalog/15821613.